题解 | #牛客的课程订单分析(七)#

可以参考一下。

WITH order_new AS (
    SELECT *
    FROM (
         SELECT
         *,
        count(*) OVER (PARTITION BY user_id) rk
    FROM order_info o
    WHERE date > '2025-10-15'
    AND product_name IN ('C++', 'Java', 'Python')
    AND status = 'completed'
             )t1
    WHERE t1.rk > 1
)
SELECT
    DISTINCT ifnull(c.name,'GroupBuy') source,
    count(*) OVER (PARTITION BY c.name) cnt
FROM order_new o
LEFT JOIN client c
ON o.client_id = c.id
ORDER BY source;